Cut-off-valve gear



(No Model.) 2 sheetssheet 2.

E.. ONBILL.

GUT-OFF VALVE GEAR,

No.' 271,352. Patent-ed Jan.30,1883.

I v, paensv Pham-Limogmpm, washington. n. c.

UNITED STATES PATENT OFFICE.

EUGENE ONEILL, OF SAN FRANCISCO, CALIFORIA.

CUT-OFF-VALVE GEAR.

SPECIFICATION forming part of Letters Patent No. 271,352, dated January30, 1883.

Application tiled February 18, 1882. (No model.)

To all whom tt may concern Be it known that I, EUGENE ONEILL, ot' thecity and county ot' San Francisco, State ot California, have invented anAutomatic CutO-Valve Gearfor Engines; and I hereby v declare thefollowing to be a full, clear, and

ton is moved by the pressure of air, steam, or

water to actuate the tripping-arms, by which the steam-valves arereleased, so as to regulate their point of cutting otfand the amount ofsteam which will be let into the cylinder at each stroke, as will bemore fully explained by reference to the accompanying drawings, in whichFigure l is a side view of the engine. Figs. 2 and 3 are details ot'construction.

A is the stem of the steam-inlet valve, and B is the stem oftheexhaust-valve. These valves are operated by a mechanism which is fullyshown and described in a patent which was issued to me May 25, 1880, No.227,918; and my present invention is designed to provide a means forregulating the point at which the steam is to be cut ofi' and by whichthe speed of the engine is governed. 4 y

The eccentric (l, by which the valves are opened, and the one D, bywhich the cut-oft' is operated, are lixed to a shaft, E, which ex.-tends parallel with the cylinder at one side, and is driven by abevel-gearing from the mainv engine-shaft.

The cut-oit` mechanism consists of a rockerarm, F, which is osoillatedso as to trip the valve at the proper time, and the change in itsposition txes the time, as shown in my former patent.

In the present case I have shown a rookshaft, Gr, supported parallelwith the cylinder and oscillated by means of the eccentric I).Crank-arms H are fixed to it at each end, and these are united by aloose shaft. I, upon which the crank-arms K are xed. These arms areheld, so as to be moved with the oscillations of the arms H and shaft Iby an arm, K', which is fixed tothe shaft l,and has a connectingrod, L,which unites it with the governor or regulator. The upper ends of thearms Kare connected with the rocker-arms, so that any change in theirposition relative to their shaft will produce a corresponding change inthe angle of the rocker-arm and the time of the tripping of the valve.The arm K may be connected with the movable sleeve upon thegovernor-spindle, so as to be operated by the action ofthe governor; orit may be connected with the piston M, which moves within the cylinderN, and is operated either by the pressure of steam from the boiler whichsupplies the engine, or by the pressure ot air from v the receiver intowhich air is being forced by the engine, or by the pressure of waterfrom a receiver or accumulator which is supplied by the engine. The pipeS connects the cylinder with the boiler or receiverfrom which pressureis derived. In the present case the piston or plunger M is connectedwith a leverarm, O, andthis is connected with the arm K by the rod L, so-that the movements of the pistons are transmitted to the rocker'armsand the tripping mechanism, as before described.

lJ is a weight, which is {ixed upon au arm, Q, extending downward andoutward diago` nally from the shaft R. which forms the fulcrum of thelever O. When the piston raises the lever, and then turns the fulcrum R,itwill also raise the weight, and 'when the pressure upon the pistondecreases, the weight acts to force the piston down and return the partsto their former position.

It will be seen that the weight prevents any sudden changes by itsinertia, and its power increases as the piston is raised, because'it iscarried farther from a perpendicular. The lever O has ahandle at O', bywhich it andthe connected parts may be moved independent of thepressure-cylinder or governor. A setscrew, T, serves to clamp or holdthe piston at any point, so that the engineer may set the cut-oft' atany desired point independent of the automatic regulating device.

I am aware that a piston running in a cylinder under the pressure ofsteam, air, or water, and connected with the valve-tripping or cut-oli'mechanism of an engine by intermediate mechanism, is old, and such I donot wish IOO to be understood as claiming broadly as of my invention.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

1. The means hereinv described for operating the cut-off mechanism of anengine, consisting ofthe arms K K, connected with the valvetripp'ingdevices, and the arm K', connected with the regulating 0r governingapparatus, as shown, said, arms being keyed to a shaft, 1, jonrnaled intheendsof the cranks H,\vhich are keyed to the shaft G, so as to beoscillated by the action of the eccentric from the main shaft,substantially as herein described.

2. The. cut-oft'regnlating device of an engine, consisting of thepistonM, moving within the cylinder N, and connected With thesteamvalve-tripping devices, as shown, in combination with the lever OO' and the set-screw T, substantially as herein described.

3. The arm Q, secured to the shaft R so as to remain normally at anincline to a perpendicular, and provided with the Weight P at its end,in combination with the l'ever O and cutoftregnlating device ll/I N,whereby the change ot' the arm Q in relation to the perpendicularautomatically varies the resistance of Weight P, substantially as setforth.

In witness whereof I have hereunto set my hand.

EUGENE ONEILL.

Witnesses:

S. H. NoURsE, G. W. EMERSON.

